Modelling midrange radionuclide dispersion and deposition ......Trillo NPP Position – 40º42'4'' N...
Transcript of Modelling midrange radionuclide dispersion and deposition ......Trillo NPP Position – 40º42'4'' N...
Modelling midrange radionuclide dispersion and deposition from an hypothetical NPP accident:
Trillo NPP scenario
EMRASII project
Localization
Trillo NPP
Madrid
Guadalajara
Trillo NPP
● Position– 40º42'4'' N– 2º37'23'' W
● Started operation in 1987; 1043 MW; PWR● Distances to nearest urban areas
– Guadalajara (81200 hab): 46 km– Madrid (metropolitan area): 70 km
Scenario objective
● Based on a hypothetical release of radioactivity from a NPP
● It is intended to provide an opportunity to test model predictions for midterm atmospheric dispersion:– Ground deposition– Air timeintegrated concentrations– Contamination time series at selected locations
Input data
● Geographic data– Topography– Points of interest
● Meteorological data– Wind fields
● Release data– Radionuclides released– Duration and magnitude of releases
Topography NOAA Geodas database1 min resolution
Elevations (m) above sea level
Meteorological data
Files contain wind fields 10 m above the ground calculated with WINMOD modelin the format: i,j,x,y,u,v
Wind field 10 m above the ground. Stable atmosphere
Wind field calculated with WINMOD model (Univ of North Wales, UK)
Release data
Steam generator tube rupture scenario developed by IRSN– Two radionuclides: 137Cs and 131I– Release duration: 1 hour– Variable release rate for both radionuclides– Effective release height: 50 m– Simulation time: 10 hours
Simulation endpoints
● Contour map of deposited activity (Bq/m2) on the ground at the end of the simulation.
● Contour map of time integrated air activity concentration
(Bq/m3)×min at ground level (averaged value up to 50 m over the ground).
● Time series of activity concentration in air Bq/m3 (averaged value from ground level to 50 m) at three points: Guadalajara, downtown Madrid and an intermediate point between TNPP and Guadalajara.
Files provided with scenario
● trillo.xyz: topography● trillostuv.dat: wind field for stable atmosphere● trillonsuv.dat: wind field for neutral atmosphere● scenarios_EMRAS2.pdf: accident description● releases.xls: release data